Using a non-constant pointer to non-constant data : const pointer « Pointer « C Tutorial

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C Tutorial » Pointer » const pointer 
10.9.3.Using a non-constant pointer to non-constant data
#include <stdio.h>
#include <ctype.h>

void convertToUppercasechar *sPtr )/* prototype */

int main()
{
   char string[] "characters and abcde";

   printf"The string before conversion is: %s", string );
   convertToUppercasestring );
   printf"\nThe string after conversion is: %s\n", string )
          
   return 0;

}

void convertToUppercasechar *sPtr )
{
   while *sPtr != '\0' ) {
      if islower*sPtr ) ) {
         *sPtr = toupper*sPtr );
      }
      ++sPtr;
   
}
The string before conversion is: characters and abcde
The string after conversion is: CHARACTERS AND ABCDE
10.9.const pointer
10.9.1.Attempting to modify a constant pointer to non-constant data
10.9.2.Attempting to modify data through a non-constant pointer to constant data.
10.9.3.Using a non-constant pointer to non-constant data
10.9.4.A non-constant pointer to constant data
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